Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manual de usuario Pagina 53

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Appendix A
AĆ12
= 476 + 36
= 512 ms
CT2 = Not a block-transfer channel
CT3 = [68] x [1] + 1 x 9
= 68 + 9
= 77 ms
CT4 = Not an active channel
4. Compute the encoder read-/write-block-transfer time. Example
values have been added.
Program Scan:
Time (program)=2.5 ms/1K words x 20K words
=2.5 x 20
=50 ms
Scanner Scan:
Time (read or write) = 512 ms for channel 1 and 77 ms for channel 3
(from Step 3).
Read/Write
Time =Program scan + 2 [Scanner scan]
(encoder =50 + 2 [512]
module in =50 + 1024
channel 1) =1074 ms
=1.1 seconds
Time =Program scan + 2 [Scanner scan]
(encoder =50 + 2[77]
module in =204 ms
channel 3)
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